By Paul Vigna @paulvigna [email protected] Paul Vigna Biography CONNECT @paulvigna [email protected] Paul Vigna Biography Jamie Dimon isn’t very impressed by bitcoin. Bitcoiners, in turn, don’t appear terribly impressed by Jamie Dimon. Reuters The virtual currency, which a year ago at this time was known only by a small band of enthusiastic libertarians, techies, and alleged drug traffickers, has gotten so much larger in the intervening time that it gets talked about at the big Capitalismpalooza called the World Economic Forum at Davos. That in itself is interesting. But J.P. Morgan 's Jamie Dimon and U.S. Treasury Secretary Jacob Lew were both asked their opinions and both talked it down, and both harped on its use in drug trafficking. The reaction from bitcoiners was just as dismissive. “It’s a terrible store of value,” Mr. Dimon said in an interview with CNBC . “It co...